This is an optional ST Racing Concepts Arrma Outcast 6S Aluminum Rear Wing Mount Base, intended for use with the Arrma Outcast 6S. This CNC Machined aluminum Rear Wing Mount Base improves the durability of your Outcast 6S by helping to prevent the rear wing from twisting out of the rear gearbox. This is available in a variety of anodized colors to allow you to add a personalized look to your ride.